When you have run out of ammo and feel like all is lost, feel confident you will still go down swinging with the help from the new Compact Rail Mounted BB Launcher from HFC. This tiny launcher can be quickly attached onto any airsoft gun sporting a 20mm picatinny/weaver rail, and is constructed from a high strength polymer to provide ultimate durability against the hardships of airsoft warfare. 40 BBs are fired each time the ring is pulled making it the perfect last resort option if an enemy pulls up on you while reloading. Green Gas or propane operates this BB launcher, which is filled directly into the launcher itself. The Compact Rail Mounted BB Launcher is one of the most unique and convenient launchers available on the market today, so see what all the hype is about and try one out for yourself!